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What are the factors of 4x² + 12x + 9 − y²?

Answer and explanation

Correct answer: (2x + 3 − y)(2x + 3 + y)

The direct answer is A: (2x + 3 − y)(2x + 3 + y). First group the first three terms: 4x² + 12x + 9 = (2x + 3)², because (2x)² = 4x², 2(2x)(3) = 12x, and 3² = 9. The expression therefore becomes (2x + 3)² − y². Now use P² − Q² = (P − Q)(P + Q), taking P = 2x + 3 and Q = y. This gives option A. Option B corresponds to (2x − 3)² − y² and would have −12x. Option C does not reproduce the original middle and constant terms. Option D is a square of a sum and would contain positive y² and additional mixed terms. Memory cue: make the perfect square first, then use difference of squares.

Related tags

Perfect SquareDifference Of SquaresFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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